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Environmental Engineering in CE

Environmental Engineering in CE
Methyl iso-cynate (MIC) gas (TLV <1 ppm), which caused Bhopal gas tragedy in 1984 falls under the category of __________ toxic gas.

Moderately
Extremely
Very extremely
Highly

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Environmental Engineering in CE
Presence of dissolved impurities of __________ is responsible for the red brownish color of water.

Carbonates
Iron & manganese
Bi-carbonates
Arsenic

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Environmental Engineering in CE
Polluted water having low BOD are most economically treated in

Oxidation ponds
Sedimentation tanks
Clarifier
Sludge digester

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Environmental Engineering in CE
Tolerable limit of nitrogen oxides in air is __________ ppm.

0.1
25
5
1

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Environmental Engineering in CE
Insufficient washing of sand grains in a rapid sand filter causes

Expansion of filtering media
Mud balls
Air binding
Shrinkage of filtering media

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Environmental Engineering in CE
__________ plant emits large amount of SO₂ as an air pollutant.

Chloralkali
Nitric acid
Sulphuric acid
Iron & steel

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